Projectile Energy Dependence of Aluminum and Silicon Ka X-Ray Satellites.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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The K alpha satellite spectra of aluminum and silicon produced by collisions with 5.4 to 40.6 MeV helium ions, 12.0 to 74.1 MeV carbon ions, and 23.4 to 117.0 MeV neon ions have been measured. The apparent average L-vacancy fractions P sub L determined from the relative intensities of the satellite peaks were observed to be dependent on the projectile energy and atomic number and on the target atomic number. Comparisons of the binary-encounter approximation BEA and semiclassical approximation SCA predictions with the experimental PL values as a function of the projectile-to-L-shell electron velocity ratio for helium on aluminum are presented. It was found that the BEA greatly over-predicted the degree of L-shell ionization and failed to accurately predict the shape of the velocity dependence. The SCA predicted the shape of the dependence at the higher velocities but was too low in magnitude. Author
- Nuclear Physics and Elementary Particle Physics